Patent US2056830A successfully refreshed from Google Patents.
US2056830A
Expired / Lapsed
US
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Preparation of polyglycols
Assignee: Dow Chemical Co
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Filing: 1934-09-11
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Granted: 1936-10-06
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Expires: 1954-09-11
Abstract
No abstract record available.
Inventors
- 👤 Gerald H Coleman
- 👤 Garnett V Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:23
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-10-06 | 1940-04-06 | 1940-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-10-06 | 1944-04-06 | 1944-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-10-06 | 1948-04-06 | 1948-10-06 | $7700.00 | Window Closed / Lapsed |